EP3896019A1 - Système de transport de feuille - Google Patents

Système de transport de feuille Download PDF

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Publication number
EP3896019A1
EP3896019A1 EP20169913.9A EP20169913A EP3896019A1 EP 3896019 A1 EP3896019 A1 EP 3896019A1 EP 20169913 A EP20169913 A EP 20169913A EP 3896019 A1 EP3896019 A1 EP 3896019A1
Authority
EP
European Patent Office
Prior art keywords
sheet
pinch roller
roller set
rotation
lateral direction
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Granted
Application number
EP20169913.9A
Other languages
German (de)
English (en)
Other versions
EP3896019B1 (fr
Inventor
Sjirk H. KOEKEBAKKER
Joseph A. Schulkes
Johan P. SMITS
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Canon Production Printing Holding BV
Original Assignee
Canon Production Printing Holding BV
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Canon Production Printing Holding BV filed Critical Canon Production Printing Holding BV
Priority to EP20169913.9A priority Critical patent/EP3896019B1/fr
Priority to US17/225,870 priority patent/US11472652B2/en
Publication of EP3896019A1 publication Critical patent/EP3896019A1/fr
Application granted granted Critical
Publication of EP3896019B1 publication Critical patent/EP3896019B1/fr
Active legal-status Critical Current
Anticipated expiration legal-status Critical

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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
    • B65H—HANDLING THIN OR FILAMENTARY MATERIAL, e.g. SHEETS, WEBS, CABLES
    • B65H9/00—Registering, e.g. orientating, articles; Devices therefor
    • B65H9/002—Registering, e.g. orientating, articles; Devices therefor changing orientation of sheet by only controlling movement of the forwarding means, i.e. without the use of stop or register wall
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
    • B65H—HANDLING THIN OR FILAMENTARY MATERIAL, e.g. SHEETS, WEBS, CABLES
    • B65H7/00—Controlling article feeding, separating, pile-advancing, or associated apparatus, to take account of incorrect feeding, absence of articles, or presence of faulty articles
    • B65H7/02—Controlling article feeding, separating, pile-advancing, or associated apparatus, to take account of incorrect feeding, absence of articles, or presence of faulty articles by feelers or detectors
    • B65H7/06—Controlling article feeding, separating, pile-advancing, or associated apparatus, to take account of incorrect feeding, absence of articles, or presence of faulty articles by feelers or detectors responsive to presence of faulty articles or incorrect separation or feed
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
    • B65H—HANDLING THIN OR FILAMENTARY MATERIAL, e.g. SHEETS, WEBS, CABLES
    • B65H7/00—Controlling article feeding, separating, pile-advancing, or associated apparatus, to take account of incorrect feeding, absence of articles, or presence of faulty articles
    • B65H7/02—Controlling article feeding, separating, pile-advancing, or associated apparatus, to take account of incorrect feeding, absence of articles, or presence of faulty articles by feelers or detectors
    • B65H7/06—Controlling article feeding, separating, pile-advancing, or associated apparatus, to take account of incorrect feeding, absence of articles, or presence of faulty articles by feelers or detectors responsive to presence of faulty articles or incorrect separation or feed
    • B65H7/10—Controlling article feeding, separating, pile-advancing, or associated apparatus, to take account of incorrect feeding, absence of articles, or presence of faulty articles by feelers or detectors responsive to presence of faulty articles or incorrect separation or feed responsive to incorrect side register
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
    • B65H—HANDLING THIN OR FILAMENTARY MATERIAL, e.g. SHEETS, WEBS, CABLES
    • B65H9/00—Registering, e.g. orientating, articles; Devices therefor
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
    • B65H—HANDLING THIN OR FILAMENTARY MATERIAL, e.g. SHEETS, WEBS, CABLES
    • B65H9/00—Registering, e.g. orientating, articles; Devices therefor
    • B65H9/20—Assisting by photoelectric, sonic, or pneumatic indicators
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
    • B65H—HANDLING THIN OR FILAMENTARY MATERIAL, e.g. SHEETS, WEBS, CABLES
    • B65H2301/00—Handling processes for sheets or webs
    • B65H2301/30—Orientation, displacement, position of the handled material
    • B65H2301/33—Modifying, selecting, changing orientation
    • B65H2301/331—Skewing, correcting skew, i.e. changing slightly orientation of material
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
    • B65H—HANDLING THIN OR FILAMENTARY MATERIAL, e.g. SHEETS, WEBS, CABLES
    • B65H2404/00—Parts for transporting or guiding the handled material
    • B65H2404/10—Rollers
    • B65H2404/14—Roller pairs
    • B65H2404/144—Roller pairs with relative movement of the rollers to / from each other
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
    • B65H—HANDLING THIN OR FILAMENTARY MATERIAL, e.g. SHEETS, WEBS, CABLES
    • B65H2404/00—Parts for transporting or guiding the handled material
    • B65H2404/10—Rollers
    • B65H2404/14—Roller pairs
    • B65H2404/147—Roller pairs both nip rollers being driven
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
    • B65H—HANDLING THIN OR FILAMENTARY MATERIAL, e.g. SHEETS, WEBS, CABLES
    • B65H2511/00—Dimensions; Position; Numbers; Identification; Occurrences
    • B65H2511/20—Location in space
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
    • B65H—HANDLING THIN OR FILAMENTARY MATERIAL, e.g. SHEETS, WEBS, CABLES
    • B65H2511/00—Dimensions; Position; Numbers; Identification; Occurrences
    • B65H2511/20—Location in space
    • B65H2511/24—Irregularities, e.g. in orientation or skewness
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
    • B65H—HANDLING THIN OR FILAMENTARY MATERIAL, e.g. SHEETS, WEBS, CABLES
    • B65H2513/00—Dynamic entities; Timing aspects
    • B65H2513/10—Speed
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
    • B65H—HANDLING THIN OR FILAMENTARY MATERIAL, e.g. SHEETS, WEBS, CABLES
    • B65H2513/00—Dynamic entities; Timing aspects
    • B65H2513/50—Timing

Definitions

  • the invention relates to a sheet transport system for moving a sheet in a transport direction x while adjusting a position of the sheet in a lateral direction z normal to the transport direction x to a target position, the system comprising first and second pinch roller sets spaced apart from one another in the transport direction x, each pinch roller set comprising two pairs of pinch rollers spaced apart from one another in the lateral direction z, each pair forming a nip for pinching and driving the sheet with an individually controllable speed.
  • Sheet transport systems of this type are typically employed in printers or copiers or, more generally, in sheet processing apparatus for moving media sheets through successive processing stations of the apparatus.
  • the sheet transport system is not only capable of supplying the sheets at the correct timings to the correct positions in the transport direction x but also to correct possible deviations of the sheets in the lateral direction z by re-adjusting the sheets to the target position. In most cases, it is also required that the sheet transport system is capable of correcting possible skew errors of the sheets by rotating the sheets such that their leading and trading edges are exactly aligned in the lateral direction z.
  • a transport system of the type indicated above is characterized by comprising a detection system for detecting a position of the sheet in the lateral direction z while the sheet is pinched by the first pinch roller set, and a control system configured for carrying out the following actions:
  • the z-position of a sheet can be controlled without any specific moving means for moving the sheet in z-direction, simply by appropriately controlling the pinch rollers that are responsible for the transport of the sheet in the transport direction x.
  • the invention takes advantage of the fact that a rotation of the sheet can be induced by driving the pinch rollers on the left and right sides of the sheet transport path with differential speed, and that such a rotation of a sheet induces a lateral movement of the leading part of the sheet that is already located downstream of the pinch roller set that induces the rotation. Consequently, the rotation can be controlled such that the leading edge of the sheet reaches the second pinch roller set in a corrected z-position.
  • the second pinch roller set is used for rotating the sheet again, this time in order to correct the skew angle.
  • the system can also be utilized for correcting a possible initial skew error of the sheet.
  • the speed of the pinch rollers may also be controlled such that a possible x-position (or timing) error will also be corrected.
  • Fig. 1 essential parts of a sheet transport system, e.g. in a printer, have been shown in plan view.
  • the sheet transport system comprises a first pinch roller set 10 and a second pinch roller set 12 each of which comprises two pairs 14, 16, 18, 20 of pinch rollers.
  • pinch rollers 22 of each pair form a nip for pinching a media sheet 24 that has been supplied into the nips.
  • the pinch rollers 22 of each pair rotate in opposite directions of rotation so as to advance the sheet 24 in a transport direction x.
  • a sheet that arrives from below in Fig. 1 will at first be pinched and advanced only by the first pinch roller set 10 and will then be pinched and advanced also by the second pinch roller set 12, whereafter the trailing edge of the sheet will leave the nips of the pinch roller pairs 14 and 16.
  • Edge detectors 26 are arranged in the vicinity of each pinch roller pair 14, 16 of the first pinch roller set 10 for detecting the timings at which leading and/or trailing edges of the sheets move past the detectors.
  • An edge detector 28 is provided at a location between the first and second pinch roller sets 10, 12 for detecting a position of a lateral edge of the sheet in a lateral direction z.
  • the edge detector 28 can detect any possible z-position error of the sheets passing through.
  • Target positions zL and zR for the left and right edges of the sheets have been indicated by dashed lines in Fig. 1 .
  • the edge detectors 26 and 28 are electronically connected to a control system 30 that contains a processor for controlling the pinch roller pairs 14, 16, 18 and 20. It will be observed that the speeds of rotation of the pinch rollers 22 can be controlled independently for each of the four pinch roller pairs.
  • Fig. 3 illustrates a situation where a sheet arrives at the first pinch roller set 10 in a position 24a.
  • the sheet has a z-position error and a skew angle error, as has been shown exaggeratedly in the drawing.
  • the skew angle error can be calculated from the known transport speed and the timings at which the leading edge of the sheet passes the edge detectors 26. Then, the pinch roller pairs 14 and 16 may be controlled to rotate the sheet so as to correct the skew angle error, as will now be explained by reference to Fig. 4 .
  • the sheet is of course advanced in positive x-direction with a certain speed vT, symbolized by a dashed arrow in Fig. 4 .
  • the rotation described above can be superposed to this translational movement by driving the right pinch roller pair 16 with a speed vT+ ⁇ v and driving the left pinch roller pair 14 with a speed vT- ⁇ v. Then, the displacement at each point of the sheet would be given by a vector that is the sum of the translation vector and the local rotation vector.
  • Fig. 5 shows the sheet in the position 24b and in two later positions 24c and 24d during the rotation about the point C'.
  • the edge detector 28 can measure a unique z-position of the right edge of the sheet, and the z-position error of the sheet can be determined by comparing the detected edge position to the target position zR for the right edge.
  • a certain reference point 32 may be defined on the leading part of the sheet, i.e. the part of the sheet that is already downstream of the first pinch roller set 10.
  • the exact position of the reference point 32 on the sheet is not critical. In the example shown, the reference point is located on the right edge of the sheet and in some distance from the leading edge.
  • an angular speed of the further rotation about the point C' i.e. a suitable differential speed of the pinch roller pairs 14 and 16, such that the reference point 32 will reach the target position zR at a time at which the sheet is not yet pinched by the second pinch roller set 18, 20.
  • the position 24d in Fig. 5 is the position in which the reference point 32 has just reached the target position.
  • the rotation of the sheet about the point C' is stopped, i.e. the pinch roller pairs 14 and 16 are driven with identical speeds, so that the sheet is advanced in positive x-direction without being rotated.
  • Fig. 6 shows the sheet in a position 24e at the end of this pure translational movement.
  • the reference point 32 is still on the target position zR.
  • the sheet is now pinched by the pinch rollers of the second pinch roller set 12 whereas the trailing edge of the sheet has left the first pinch roller set 10.
  • the sheet can now be rotated by driving the pinch roller pairs 18 and 20 with differential speeds. Since the previous rotation of the sheet has led to a substantial skew error, the sheet will now be rotated in opposite direction in order to correct the skew error, but without spoiling the alignment of the reference point 32 on the target position zR.
  • the differential speed of the pinch roller pairs 18 and 20 results in a rotation about a center point that is located on the axis of the second pinch roller set 12 (on the right side in Fig. 6 but outside of the area of the drawing). Consequently, the reference point 32 will move on a circular arc 34 about this rotation center. During this movement, the reference point 32 will temporarily leave the reference position zR, but will meet the reference position once again after having travelled through a curved path segment 36 that is symmetric with respect to the second pinch roller set 12. The angular speed and the timing of the rotation are calculated such that the skew angle error will be corrected, i.e.
  • the leading edge of the sheet extends exactly in z-direction at the very moment when the reference point 32 reaches again the target position zR.
  • this position designated as 24f, both the z-position error and the skew error have successfully been corrected, and the sheet may be advanced further in a pure translational movement in the transport direction x.
  • the edge detectors 26 are also capable of detecting a skew angle of the sheet by detecting the trailing edge of the sheet. This possibility may be utilized for example for checking the result of the first rotation when the sheet moves from the position 24d in Fig. 5 to the position 24e in Fig. 6 .

Landscapes

  • Registering Or Overturning Sheets (AREA)
  • Controlling Sheets Or Webs (AREA)
EP20169913.9A 2020-04-16 2020-04-16 Système de transport de feuille Active EP3896019B1 (fr)

Priority Applications (2)

Application Number Priority Date Filing Date Title
EP20169913.9A EP3896019B1 (fr) 2020-04-16 2020-04-16 Système de transport de feuille
US17/225,870 US11472652B2 (en) 2020-04-16 2021-04-08 Sheet transport system

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
EP20169913.9A EP3896019B1 (fr) 2020-04-16 2020-04-16 Système de transport de feuille

Publications (2)

Publication Number Publication Date
EP3896019A1 true EP3896019A1 (fr) 2021-10-20
EP3896019B1 EP3896019B1 (fr) 2022-11-23

Family

ID=70292911

Family Applications (1)

Application Number Title Priority Date Filing Date
EP20169913.9A Active EP3896019B1 (fr) 2020-04-16 2020-04-16 Système de transport de feuille

Country Status (2)

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US (1) US11472652B2 (fr)
EP (1) EP3896019B1 (fr)

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP4530237A1 (fr) 2023-09-28 2025-04-02 Canon Production Printing Holding B.V. Procédé d'empilement de feuilles imprimées alignées sur un bord d'une palette
WO2025165397A1 (fr) 2024-01-29 2025-08-07 Kohlam, Llc Dispositif d'alignement de composite multicouche

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4971304A (en) * 1986-12-10 1990-11-20 Xerox Corporation Apparatus and method for combined deskewing and side registering
EP0814041A2 (fr) * 1996-06-17 1997-12-29 C.P. Bourg S.A. Procédé pour tourner des feuilles et empiler de feuilles muni d'un dispositif pour tourner des feuilles
EP1253097A1 (fr) * 2001-04-20 2002-10-30 Kabushiki Kaisha Toshiba Appareil de traitement de matériaux semblable au papier avec une structure simplifiée d'un capteur pour détecter des caractéristiques
EP2261150A2 (fr) * 2009-06-10 2010-12-15 Kabushiki Kaisha Toshiba Dispositif de réorientation et appareil correspondant de traitement de matériaux de type papier

Family Cites Families (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5169140A (en) * 1991-11-25 1992-12-08 Xerox Corporation Method and apparatus for deskewing and side registering a sheet
EP0814040B1 (fr) * 1996-06-17 2000-07-26 C.P. Bourg S.A. Procédé pour l'alignement de feuilles et empileur de feuilles muni d'un dispositif d'alignement de feuilles
JP5163378B2 (ja) * 2008-09-09 2013-03-13 コニカミノルタビジネステクノロジーズ株式会社 用紙搬送装置及び画像形成装置

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4971304A (en) * 1986-12-10 1990-11-20 Xerox Corporation Apparatus and method for combined deskewing and side registering
EP0814041A2 (fr) * 1996-06-17 1997-12-29 C.P. Bourg S.A. Procédé pour tourner des feuilles et empiler de feuilles muni d'un dispositif pour tourner des feuilles
EP1253097A1 (fr) * 2001-04-20 2002-10-30 Kabushiki Kaisha Toshiba Appareil de traitement de matériaux semblable au papier avec une structure simplifiée d'un capteur pour détecter des caractéristiques
EP2261150A2 (fr) * 2009-06-10 2010-12-15 Kabushiki Kaisha Toshiba Dispositif de réorientation et appareil correspondant de traitement de matériaux de type papier

Also Published As

Publication number Publication date
EP3896019B1 (fr) 2022-11-23
US20210323782A1 (en) 2021-10-21
US11472652B2 (en) 2022-10-18

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